Edit: here we go. She says, "You said I could use it." I said I changed my mind.
Burned, she just bought an 800 dollar set of tires WITHOUT YOUR PERMISSION. Sending a text and then not waiting for a reply before buying is not acceptable. By the way, your lack of a response to her text is NGS too. If you don't know how to reply then say something like "let's discuss this later when I have a few minutes". It surely was not an emergency. She just can't spend like she's half of a married couple anymore. You've got to put a stop to that.
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She said "That's unfair, you agreed to pay for my living expenses." So I'm not responding yet.
"And you agreed to love, honor and cherish me until death do we part, yet here we are." Don't say that, but it sure is tempting. She can't play the honor card against you after she's already burned it herself. And.... how is it that snow tires are a "living expense"? Plenty of people get by just fine without them. Tell her to get chains, wouldn't that be a nice wakeup call to what she's doing when she has to get up and it's zero and snowing out and she needs to put those on her car!
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Edit 2: she followed up with, "how about you start sending me checks." Yikes.
"I will take it under consideration." I can't remember if you have an L but if you do then talk to him/her about your legal responsibilities in supporting her during S. No more free reign on checkbook and CC. Let her pitch a fit, like someone else said what is she going to do, walk out on the M?